Cartridge for a water purification and treatment system



FIG. 1 is a perspective view of the design subject;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof with the left side being a mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view. 

The ornamental design for cartridge for a water purification and treatment system, as shown and described. 